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Idiomas disponibles
6
Hydraulic system
6.1
Fuel supply
Double-pipe circuit (Fig. 19)
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in the table at the side.
The tank higher than the burner A
The distance "P" must not exceed 10 meters in order to avoid
subjecting the pump's seal to excessive strain; the distance "V"
must not exceed 4 meters in order to permit pump self-priming
even when the tank is almost completely empty.
The tank lower than the burner B
Pump depression of 0.45 bar (35 cm Hg) must not be exceeded
because at higher levels gas is released from the fuel, the pump
starts making noise and its working life-span decreases.
It is good practice to ensure that the return and suction lines enter
the burner from the same height; in this way it will be less proba-
ble that the suction line fails to prime or stops priming.
Hydraulic system
The loop circuit
A loop circuit consists of a loop of piping departing from and re-
turning to the tank with an auxiliary pump that circulates the fuel
under pressure. A branch connection from the loop goes to feed
the burner. This circuit is extremely useful whenever the burner
pump does not succeed in self-priming because the tank dis-
tance and/or height difference are higher than the values listed in
the table.
+ H
- H
(m)
+ 4.0
+ 3.0
+ 2.0
D701
+ 1.0
+ 0.5
0
- 0.5
- 1.0
- 2.0
Fig. 19
- 3.0
- 4.0
Key
H = Pump/Foot valve height difference
L = Piping length
Ø = Inside pipe diameter
1 = Burner
2 = Pump
3 = Filter
4 = Manual on/off valve
5 = Suction line
6 = Foot valve
7 = Rapid closing manual valve - remote controlled (only Italy)
8 = On/off solenoid valve (only Italy)
9 = Return line
10 = Check valve (only Italy)
17
GB
L (m)
TECNO 70-L
TECNO 100-L - 130 L
Ø (mm)
10
12
14
12
51
112
150
71
45
99
150
62
39
86
150
53
32
73
144
44
29
66
132
40
26
60
120
36
23
54
108
32
20
47
96
28
13
34
71
19
7
21
46
10
-
8
21
Ø (mm)
14
16
138
150
122
150
106
150
90
150
82
150
74
137
66
123
58
109
42
81
26
53
-
10
25
Tab. D
6088
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